A time-over-threshold technique for PMT signals processing

A time-over-threshold technique for PMT signals processing 1 first-author 1 corresp Corresponding auther. E-mail: liushb@ustc.edu.cn Corresponding auther. E-mail: liushb@ustc.edu.cn liushb@ustc.edu.cn 1 Fast Electronics Lab, Modern Physics Department, University of Science and Technology of China, Hefei 230026, China Fast Electronics Lab, Modern Physics Department, University of Science and Technology of China, Hefei 230026, China A novel front-end circuit designed for PMT signals processing considering the solution of "Time Walk" correction is discussed in this paper. We are trying to apply the TOT (Time over Threshold) technique to our research. Different from traditional ways, where amplitude is measured, time width is measured for slew correction here, which takes the advantage of TDC. Expensive fast ADCs are abandoned and the whole time measurement electronics design becomes more effective and economical. Test boards have been developed and a convenient method is introduced to evaluate our TOT technique. Results have shown that a 10ps slew correction resolution is achieved throughout the amplitude range from -108mV to -2000mV for negative signals of both 5 ns leading and trailing edge with 10 ns 50%-50% pulse width. Time over threshold Time measurement Slew correction PMT HPTDC Variable thresholds discrimination References LI Cheng , WU Jian , CHEN Hongfang , et al . High Energy Physics and Nuclear Physics (in Chinese) , 2001 , 25 ( 9 ): 933 - 936 . High Energy Physics and Nuclear Physics (in Chinese) Antonioli P , Meneghini S . A 20 ps TDC readout module for the ALICE time of flight system design and test results , 9th Workshop on Electronics for LHC Experiments . 2003 , http://lhc-electronics-workshop.web.cern.ch . A 20 ps TDC readout module for the ALICE time of flight system design and test results CERN/LHCC , ALICE Addendum to the Technical Design Report of the Time of Flight System (TOF) , April 2002 , ISBN 92-9083-192-8 : 61 - 70 . ALICE Addendum to the Technical Design Report of the Time of Flight System (TOF) Liu Shubin , GUO Jianhua , ZHANG Yanli , et al . Nuclear Techniques (in Chinese) , 2006 , 29 ( 1 ): 72 - 76 . Nuclear Techniques (in Chinese) Gys T . An overview of current developments in position-sensitive hybrid photon detectors and photo-multiplier tubes, Nuclear Science Symposium, 1999 , Conference Record , 1999 IEEE , Volume 1 : 39 - 45 . An overview of current developments in position-sensitive hybrid photon detectors and photo-multiplier tubes, Nuclear Science Symposium, 1999 Dai Beiqian , Qian Zhiyuan . Linear circuit design, ISBN 7-312-00558-6/TN 21 , Hefei : Press of University of Science and Technology of China , 1994 , 85 - 88 . Linear circuit design, ISBN 7-312-00558-6/TN 21 Guo Jianhua , Liu Shubin , Zhou Shilong , et al . High Energy Physics and Nuclear Physics (in Chinese) , 2006 , 30 ( 8 ): 761 - 766 . High Energy Physics and Nuclear Physics (in Chinese) 10.1016/S1001-8042(07)60040-2 TM935.45,TM935.41,TL822,TN911.71 Supported by National Natural Science Foundation of China (10405023) and National Large-Scale Science Project BEPCII 2006-11-01 2007-06-20 2021-01-19 2007 Nuclear Science and Techniques 03 18